Jan: Here's an artificial position I constructed for the discussion of Mutual Damage in the context of Combinatorial Game Theory. It's obvious that this is a zero game (under Japanese scoring, of course!) because mirror go actually works here.
If Black's position in the upper left is altered slightly, how does that change the value of this game? Probably by just a teensy-tiny-miny bit, and probably not the outcome, but it never hurts to ask...